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QT issues

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I set up my first QT tank yesterday with media from my AC30s in a Penguin 150. My parameters are 0 ammonia and nitrite and less then 5 nitrates with a heater and air stone. The temp is steady at 80. The issue is my fish, there are 4 blood fins in and 3 are nicely colored and doing well. The 4th is full size and active but has not colored up. Might this be from stress of transporting and moving or is there something else I look into? They ate a little bit this morning roughly 12 hours after being added and I'm going to try and feed them a bit more tonight.